EP0314243A1 - Vorrichtung zur Kompensation der Verzerrung gekrümmter transparenter Flächen - Google Patents

Vorrichtung zur Kompensation der Verzerrung gekrümmter transparenter Flächen Download PDF

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Publication number
EP0314243A1
EP0314243A1 EP19880202353 EP88202353A EP0314243A1 EP 0314243 A1 EP0314243 A1 EP 0314243A1 EP 19880202353 EP19880202353 EP 19880202353 EP 88202353 A EP88202353 A EP 88202353A EP 0314243 A1 EP0314243 A1 EP 0314243A1
Authority
EP
European Patent Office
Prior art keywords
distortion
prism
function
receiver
produced
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19880202353
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English (en)
French (fr)
Other versions
EP0314243B1 (de
Inventor
Joel Rollin
Jean-Claude Perrin
Fernand Loy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Thomson TRT Defense
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
Thomson TRT Defense
Philips Gloeilampenfabrieken NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telecommunications Radioelectriques et Telephoniques SA TRT, Thomson TRT Defense, Philips Gloeilampenfabrieken NV filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Publication of EP0314243A1 publication Critical patent/EP0314243A1/de
Application granted granted Critical
Publication of EP0314243B1 publication Critical patent/EP0314243B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/08—Anamorphotic objectives
    • G02B13/10—Anamorphotic objectives involving prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image

Definitions

  • the invention relates to a device for compensating for the distortion resulting from the observation of a field of view through a transparent wall in a certain spectral band and the shape of which generates a distortion devoid of symmetry of revolution, said device consisting of a optical system of modular structure used in parallel beams, placed in front of a receiver and determined so that the distortion resulting from the curvature and the variation in length of the lines introduced by said optical system is in the opposite direction to the distortion total caused by said wall to obtain an approximate correction value giving an acceptable residual distortion, said variation in length and said curvature being produced respectively by means of an anamorphosis function in one direction and of a deviating function in direction d 'another direction perpendicular to the previous one.
  • Such a device finds an application for example in aviation when said transparent wall constitutes the window of the aircraft and said receiver is a camera on board this aircraft and recording the scene.
  • This porthole is usually conical in shape and the optical beams passing through it are therefore subject to strong distortion which it is necessary to correct or at least reduce.
  • the aforementioned device provides an optical correction which satisfies the following conditions: -
  • the system does not alter the resolution of the image. - It is simple in design, compact and easy to adjust.
  • the purpose of the device of the invention is to correct the total distortion of the image at the level of the camera.
  • the optical system proposed to overcome these additional difficulties is remarkable in that it comprises a single prism consisting of two adjoining parts, with different refractive indices, forming an achromatic assembly, said prism performing said deflecting function and said anamorphic function. being produced by a slight change in the focal length of said receiver combined with the expansion of the lines produced by said prism in said deviating direction.
  • FIG. 1 represents the section of a portion of the windshield 1 of conical shape of an airplane, made up of a transparent substance in a determined spectral band.
  • a video camera records the landscape 2 in flight through this windshield, the crossing of which generates on the image of the scene formed in the focal plane 4 of the exit pupil 3 of the camera, an asymmetrical distortion that we propose to catch up, the X axis of the camera making an angle of - 7.5 ° with an RFH reference direction linked to the plane.
  • FIG. 2 shows the shape of the total distortion produced by the aircraft window and of those which must be introduced by the take-up device.
  • a square abcd is distorted by the window in a′b′c′d ′.
  • this device transforms the original square into a rectangle a ⁇ b ⁇ c ⁇ d ⁇ and the curvature introduced into a ′′′ b ′′′ and c ′′′ d ′′′ must be in the opposite direction to that produced by crossing the window.
  • the take-up is carried out by means of an optical system of modular structure mounted in front of the camera and a perspective view of which is shown in FIG. 3 showing the path of a ray coming from the exit pupil 3 of the camera.
  • the achromatic correcting system is composed of a set of two adjoining deflecting prisms 5 and 6 arranged between the pupil 3 and the windshield 1.
  • Ox being the optical axis of the camera, the coordinates of any point in space are reduced to the systems of rectangular axes oxyz between the camera and the adjacent prisms and o′x′y′z ′ after deviation by said prisms.
  • the projection of this vector on the horizontal plane xoy determines the angle of deposit g with the axis ox and the angle of site s with the vector .
  • the unit vector ′ Of origin o ′ determines the angles of bearing g ′ and of site s ′ in the system o′x′y′z ′.
  • the anamorphic function is achieved by a slight change in the focal length of the observation camera combined with the dilation of the lines at constant site produced by the prismatic assembly 5 and 6.
  • the calculation program uses the following conventions to study the path of light rays: - the origin of the sites and deposits at the start of the program coinciding with the ox axis (camera axis), - the output origin coincides with ox ′, ox ′ coinciding with the camera optical axis at the output of the deflecting prism.
  • the incoming management is within the following limits: - 15 ° ⁇ g ⁇ 15 ° - 10.5 ° ⁇ s ⁇ 11.5 °
  • the windshield distorts the image, so that at the landscape level, the site and deposit become s + ⁇ s and g + ⁇ g.
  • the correction system located between the camera and the windshield must therefore change a direction (s, g) from the camera into a direction (s- ⁇ s, g- ⁇ g).
  • the focal length f becomes f + ⁇ f.
  • the deviation on y is a third order distortion depending on the field. This results in second order distortion for the effective focal length.
  • the homothetic ratio of the focal length therefore varies as a function of the field, that is to say as a function of s and of g and must be written (s, g).
  • the target direction is given by s ′ and g ′ such that: s and g being counted from the camera axis.
  • the camera lens Before correction, the camera lens has the following characteristics: Focal length: 11.2 mm Entrance pupil diameter ⁇ 10 mm.
  • ⁇ min 405 nm
  • ⁇ av 656 nm
  • ⁇ max 850 nm.
  • the deviations were calculated for ⁇ avg .
  • the prism 5 placed at the head must have a large deviation. But the drawback of such a prism is to create in the site direction a variation in the spacing of the lines at constant site.
  • the means of reducing this variation consists in placing head to tail behind the prism 5 another deviating prism 6 meeting the following conditions: the deviation produced by this prism must be much smaller so as not to cancel the curvature induced by the prism 5, - it must work in the vicinity of the minimum deflection up the field.
  • the total correction results from the combination of all these effects: - anamorphosis in the direction of bearing by modifying the focal length, - deviation and anamorphosis in the site direction produced by the prismatic assembly.
  • the deviation value of the camera optical axis has been indicated equal to - 6.108 ° downwards, the angle at the top of the prism 5 being 20 ° and the angle at the apex of prism 6 being 5.4 °.
  • the camera + prism assembly must therefore be tilted 6,108 ° upwards relative to the reference position.
  • Such a combination allows chromatography if the prisms joined 5 and 6 are produced respectively in glasses of indices 1.508 (K7) and 1.796 (SF6) for example.
  • the device of the invention has the advantages of a reduced size and therefore a reduction in costs since it only comprises two optical parts.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Eyeglasses (AREA)
EP88202353A 1987-10-27 1988-10-21 Vorrichtung zur Kompensation der Verzerrung gekrümmter transparenter Flächen Expired - Lifetime EP0314243B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8714831A FR2622307B1 (fr) 1987-10-27 1987-10-27 Dispositif de rattrapage de la distorsion totale engendree par la forme d'une paroi transparente
FR8714831 1987-10-27

Publications (2)

Publication Number Publication Date
EP0314243A1 true EP0314243A1 (de) 1989-05-03
EP0314243B1 EP0314243B1 (de) 1993-04-07

Family

ID=9356201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88202353A Expired - Lifetime EP0314243B1 (de) 1987-10-27 1988-10-21 Vorrichtung zur Kompensation der Verzerrung gekrümmter transparenter Flächen

Country Status (5)

Country Link
US (1) US4902098A (de)
EP (1) EP0314243B1 (de)
JP (1) JPH01152873A (de)
DE (1) DE3880075T2 (de)
FR (1) FR2622307B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507297A3 (en) * 1991-04-03 1993-09-15 Canon Kabushiki Kaisha System and apparatus for image information processing
CN103259887A (zh) * 2012-02-16 2013-08-21 三星电子株式会社 在电子设备中用于防止摄像机失真的窗

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2760924B1 (fr) 1997-03-14 1999-06-04 Thomson Csf Architecture optique pour systeme de vision infrarouge
FR2833717B1 (fr) * 2001-12-14 2004-02-20 Thales Sa Combinaison optique multichamp de type cassegrain
JP5030203B2 (ja) * 2006-08-29 2012-09-19 日本輸送機株式会社 フォークリフトのアクスル機構
DE102009027520A1 (de) 2009-07-08 2011-01-20 Robert Bosch Gmbh Verzeichnungskorrektur von Videosystemen
FR2969318B1 (fr) * 2010-12-21 2013-08-09 Peugeot Citroen Automobiles Sa Dispositif d'affichage tete haute a lame transparente a faces non paralleles, pour un vehicule
JP5909334B2 (ja) * 2011-07-29 2016-04-26 株式会社日立エルジーデータストレージ 光ビーム走査装置およびそれを用いた画像表示装置
DE102011118134B4 (de) * 2011-11-10 2021-12-16 Kostal Automobil Elektrik Gmbh & Co. Kg Kameraanordnung für ein Kraftfahrzeug
JP6201339B2 (ja) * 2013-02-25 2017-09-27 株式会社デンソー ヘッドアップディスプレイ装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821111A (en) * 1954-09-22 1958-01-28 Taylor Taylor & Hobson Ltd Anamorphotic optical systems
FR1222433A (fr) * 1958-04-15 1960-06-09 Système de prismes achromatiques à distance focale variable pour modifier, allonger et comprimer des images
GB1296573A (de) * 1970-09-22 1972-11-15
WO1981000499A1 (en) * 1979-07-30 1981-02-19 Singer Co Optical illumination and distortion compensator
EP0025335A1 (de) * 1979-09-05 1981-03-18 The Marconi Company Limited Stabilisierbare optische Visiergeräte und Panzerkanonensteuerung mit einem solchen Visiergerät

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1034811A (en) * 1962-01-12 1966-07-06 Watson W & Sons Ltd Improvements in or relating to microscopes
US4634241A (en) * 1984-04-27 1987-01-06 Canon Kabushiki Kaisha Stereoscopic microscope
FR2607269B1 (fr) * 1986-11-21 1989-03-24 Trt Telecom Radio Electr Dispositif de rattrapage de distorsion

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2821111A (en) * 1954-09-22 1958-01-28 Taylor Taylor & Hobson Ltd Anamorphotic optical systems
FR1222433A (fr) * 1958-04-15 1960-06-09 Système de prismes achromatiques à distance focale variable pour modifier, allonger et comprimer des images
GB1296573A (de) * 1970-09-22 1972-11-15
WO1981000499A1 (en) * 1979-07-30 1981-02-19 Singer Co Optical illumination and distortion compensator
EP0025335A1 (de) * 1979-09-05 1981-03-18 The Marconi Company Limited Stabilisierbare optische Visiergeräte und Panzerkanonensteuerung mit einem solchen Visiergerät

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
OPTICAL ENGINEERING, vol. 21, no. 1, janvier-février 1982, pages 096-104, Society of Photo-Optical Instrumentation Engineers, Bellingham, Washington, US; Y. NETZER: "Line-on-sight steering and stabilization" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507297A3 (en) * 1991-04-03 1993-09-15 Canon Kabushiki Kaisha System and apparatus for image information processing
CN103259887A (zh) * 2012-02-16 2013-08-21 三星电子株式会社 在电子设备中用于防止摄像机失真的窗
US9088703B2 (en) 2012-02-16 2015-07-21 Samsung Electronics Co., Ltd. Window for preventing camera distortion in an electronic device
CN103259887B (zh) * 2012-02-16 2016-06-01 三星电子株式会社 在电子设备中用于防止摄像机失真的窗

Also Published As

Publication number Publication date
EP0314243B1 (de) 1993-04-07
DE3880075T2 (de) 1993-10-07
DE3880075D1 (de) 1993-05-13
FR2622307B1 (fr) 1990-03-09
US4902098A (en) 1990-02-20
JPH01152873A (ja) 1989-06-15
FR2622307A1 (fr) 1989-04-28

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